Which law mandates vehicle safety features such as safety belts?

The National Traffic and Motor Vehicle Safety Act is the correct answer because it was enacted to promote vehicle safety and ensure that motor vehicles meet specific safety standards. This law mandates that vehicles are equipped with essential safety features, including safety belts, which are designed to protect occupants in the event of a crash. The act empowers the National Highway Traffic Safety Administration (NHTSA) to develop and enforce compliance with federal safety standards, making it a cornerstone of vehicle safety in the United States.

This law plays a crucial role in minimizing injuries and fatalities on the road by requiring manufacturers to implement important safety technologies. Over time, this has led to significant improvements in vehicle design and occupant protection.

The other options relate to different aspects of traffic and vehicle safety but do not specifically mandate vehicle safety features like safety belts. For example, the National Highway Safety Act is more focused on improving overall highway safety and may include programs for education and enforcement but does not primarily address vehicle design or the inclusion of safety features. The Insurance Institute for Highway Safety is involved in research and advocacy for vehicle safety but is not a legislative body that mandates such regulations. Lastly, the No Vehicle Left Behind Act is not a recognized piece of legislation related to vehicle safety features.